Stop-motion for doubling-machines



'(No Model.)

A. A. LEHMANN. STOP MOTION FOR DOUBLING MAU HINE$, &c.

Patented Apr. 2

IMMI I l Z w M% M m UNITED STATES PATENT @EEIQE.

ANTHONY A. LEHMANN, or BALTIMORE, MARYLAND.

STOP-MOTION FOR DOUBLlNG-MACHINES, 80C.

SPECIFICATION forming part of Letters Patent No. 400,694., dated April 2, 1889.

Application filed October 1887.

To all whom, it may concern:

l 3e it known that I, ANTHONY A. LEHMANN, a citizen of the United States, and a resident of the city of Baltimore and State of Maryland, have invented certain new and useful Improvements in Stop-Motions for Doubling and Twisting Machines, of which the follow- 1ng 1s a specification.

The present invention relates, generally, to devices for insuring the stoppage of the thread in thread doubling or twisting machines upon its accidental breakage or the breakage of one or more of its strands,whereby a waste of material is prevented.

It consists in a novel structure and in combinations of devices hereinafter set forth.

In the drawings, Figure 1 is a sectional elevatlon of so much of a doubling or twisting machme as is necessary to a ready understanding of the present improvements, with which it is provided. Fig. 2 is a cross-sectional elevation of the improved thread-stop. Fig. 3 is a similar view illustrating the movement of the thread-stop upon the breakage of a thread or strand. Fig. 4 is a modification hereinafter referred to.

Referring to said drawings, particularly Fig. -1, it is to be understood that A represents the longitudinal rail of a doubling or twisting frame, or it may be a spinning-machine; B C, the ordinary drawing rolls, mounted to turn in suitable bearings supported upon the rail or other part of the machine, as usual; and E represents the spindle and its bobbin, upon which the doubled or twisted thread is wound. Upon this longitudinal rail A is also mounted a bracket, 1), adapted to sustain the automatic thread-stop F, constituting the present improvements. As shown, the thread-stop consists of one or more weighted arms, 20, loosely pivoted at one end upon a longitudinal shaft, 21, the opposite end of which is provided with an eye or loop, 9, through which a thread or strand is led before passing to the drawing-rolls B C. here a plurality of weighted arms are used, they will preferably be formed one longer than the other, so that their eyes 9 will be at different elevations, to permit the strands from the arms farthest removed from the drawingrolls to pass over the others.

Serial No. 251,835. (No model.)

any one or all of the arms to cut or stop the threads should one or more of the threads or strands accidentally break. This is effected in the device illustrated by providing the cut-off or clamp G with a blade, 10, which in its normal position permits the free passage of the threads through an opening, 11, in the cut-off or clamp G, but which is immediately brought into contact with said threads to sever or clamp them upon the ac tion of one or more of the arms 20. The connection between the arms and the blade 10, so that the latter is operated by a movement of the former, may, it is obvious, be varied by any skilled mechanic; but that shown I have found very well adapted for the purpose. It consists of a short arm, 12, projecting from the shaft 21 and connected to the blade by a rod, 13. Thus when the shaft is rocked the arm and rod will reciprocate the blade away from or toward and over the opening 11, according to the direction in which the shaft is rocked. The movement of the weighted arms 20 or of one of them is communicated to the shaft by a contactpiece, 14, which projects from the shaft, and is in this construction arranged to be common to all of the weighted arms, so that as one of the latter movcsit will contact with said contact-piece and cause the shaft to be simultaneously rocked with such movement of the arm.

The blade 20 is guided in its reciprocations by a flange on its side partially embracing the cutoff or clamp G, and by a strip, 8, as shown. The upper end of the cut-off or clamp is provided with a lip, 7, which is cut away to leave the opening 11 unobstructed and extended a distance from the side of the cut-off or clamp to permit the blade to move between the lip and the cut-off or clamp, so as to better insure the entire severanceof the threads or their being positively clamped. As ithas not been found desirable in practice to keep the edge of the blade sharp enough to always oif, clamp,

effect a severance of the threads, owing to the quickness with which such edge will become brought into operation by the movement of' dulled, it will be understood that clamping the threads so as to prevent their being drawn 011- ward will efiectevery purpose requisite in practice. The arms 20 will preferably extend from a sleeve, 15, mounted loosely on the shaft 21, and provided with a shoulder,6, for contacting with a stop, 16, to limit the movement of the arms in one direction, and with a shoulder, 5, to contact with the contact-piece 11L. The weight 17, by which they are weighted, will also be a movable one, so that its effect may be made greater or less, as circumstances require. The shaft 21 and the clamp G will preferably be contained by a single frame, K, resting upon the bracket D, and the latter may be provided with oneor more set-screws, 3, to adjust the position of the frame with respect to its supporting-bracket, and also with the drawing-rolls and spool-supports J. Vith this understanding of the construction and arrangement of the improved automatic stop its operation will be readily understood. It suffices to say that each strand 'i, from its respective spool I, will be led to and through one of the eyes .0 of the weighted arms, one strand led to each eye, and from thence all the strands which are to be doubled into a single thread are passed through the opening 11 to and between the drawing-rolls 13 C, through guide 30, to the bobbin E, uponwhieh the strands as a single thread are wound, suitable motion being communicated to the drawing-rolls and to the bobbin E, the thread or strands being doubled or twisted in the usual manner. The effect of passing a strand through the eye of the weighted arm and from thence to the drawing-rolls and the arrangement of said arm will be such as to cause the latter, as the strands are kept 11ccessarily taut by the action of the rolls, to sustain the weighted arm just to one side of its equilibrium, as in Fig. 2in other words, so that the tendency of the arm will be to rock to one side, so that should the strand break its sustaining effect upon the arm will be immediately removed, and thus cause the arm to rock or fall into the position shown in Fig. 3, rocking the shaft 21, and through its arm 20 and rod 13 move the blade 10 suddenly in contact with the strands passing through the opening 11 and sever or clamp them at that point, and thus prevent any quantity of the diminished number of threads becoming wound upon the bobbin E. Of course, if the blade 10 simply serves to clamp the strands and prevent their further passage, they will be broken off between the clamp G and the drawing-rolls, so that the effect of severing them and clamping them will be the same. The clamping of the blade upon the strands will be rendered effective by arranging the arm 20 and rod 13, so that when the weighted arm is in the position shown in Fig. 3 their joints will be practically in a line with the center of the shaft, from which position they can only be moved by rocking the shaft.

The weighted arm thus permitted to fall will be restored to its normal position by the attendant simply pressing on the arm or lever 20, which is provided with an extension, 12, as shown, for this purpose, so as to rock the shaft 21, cause the contact-piece let to contact with the arm or its shoulder 5 and raise it into position, and simultaneously with this movement the blade will be moved back to its normal position away from the opening 11 ready to be again moved to sever or clamp the strands when one or more of them break.

Instead of the contact-piece 14 being formed common to all of the weighted arms 20, the construction shown in Fig. 4. maybe adopted, wherein the sleeve 15 of the weighted arm is recessed to provide an interior shoulder, 5, to contact with a stud or contact-piece, 24, projecting from the shaft 21 into the recess in the sleeve. The operation of the parts will obviously remain the same.

\Vhat I claim is 1. The combination, with a thread cutoff or clamp provided with a moving blade, of a shaft, connections between the shaft and blade to move said blade, a weighted arm pivotally mounted on said shaft and having a loop for the thread, and a contact-piece on the shaft adapted to be struck by the weighted arm as it falls, whereby the shaft and blade are moved simultaneously with the fall of the said arm, substantially as described.

2. The combination, with a thread cut-off or clamp provided with a moving blade, of a shaft, connections between the shaft and blade to move said blade, a plurality of weighted arms pivotally mounted on said shaft, each having a loop for the thread, and a contact-piece on the shaft common to all of the weighted arms, whereby the fall of either or all of the arms will simultaneously move the shaft and blade, substantially as described.

3. The combination, with a thread cut-off or clamp, of a shaft, connections between the shaft and said cutroff or clamp, a weighted arm provided at one end with a loop for the thread and at the opposite end with a sleeve loosely mounted on said shaft, and having a shoulder, 5, and a contact-piece on the shaft in position to be struck by the shoulder 011 the lllOVGll'lClll; of the weighted arm, whereby the shaft is rocked, substantially as described.

4. The combination, with a thread cutoff or clamp, of a shaft, connections between the shaft and said cut-elf or clamp, two or more weighted arms pivotally mounted on said shaft, and a contactrpiece on the shaft in position to be struck by the movement of either of said arms, whereby the shaft may be rocked by one of the aims, substantially as described.

5. The combination of a thread cut-off or clamp provided with a reciprocating blade, a shaft having an arm connected to move said blade when it is rocked, a plurality of Weighted arms loosely mounted on said shaft to this specification in the presence of two suband each having a loop for the thread, and a scribing Witnesses. contact-piece common to all of the arms in por T l v T sition to be struck by either of them upon the AN PHONX LEIIMAL 5 breakage of the thread, substantially as de- \Vitnesses:

scribed. v PH. H. HOFFMAN,

In testimony whereof I have signed my name THOS. IRELAND ELLIOTT. 

